London to Chicago Flight CO₂
London Heathrow (LHR) → O'Hare International (ORD) · 6,340 km
Economy CO₂
~539 kg
per passenger · estimate
Business CO₂
~1,887 kg
per passenger · estimate
Distance
6,340 km
great-circle
Driving equiv.
2,567 km
petrol car (EU avg)
Live calculation
Calculate exact CO₂ for LHR → ORD
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Route analysis
London–Chicago: emissions in context
~539 kg
Economy CO₂
Per passenger, one way. Calculated using ICAO v13.1 with fleet-average aircraft for the 6,340 km route.
2,567 km
Car equivalent
Driving a petrol car alone at EU average emissions (0.21 kg CO₂/km). The LHR–ORD flight emits the same as this many kilometres driven.
0.5 yr
Tree absorption
Years of CO₂ absorption by a mature tree to offset one economy passenger's share of a LHR–ORD flight.
About the London–Chicago route
The LHR–ORD route covers approximately 6,340 km great-circle distance between London Heathrow in United Kingdom and O'Hare International in USA. In economy class, each passenger is responsible for approximately 539 kg CO₂ per flight direction, or 1,078 kg for a round trip — calculated using the ICAO Carbon Emissions Calculator v13.1 methodology with fleet-average aircraft and typical load factors.
Business class passengers on the same route emit approximately 1,887 kg CO₂ per direction — roughly 3.5× more than economy — due to the larger floor area allocated to each business class seat. The climate impact is further amplified by a Radiative Forcing Index (RFI) of 1.9×, which accounts for non-CO₂ effects of aviation at cruising altitude including contrail formation and NOₓ emissions.
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